Combined receiver and detector for wireless use.



s: wmsma SCMBENED RECEiVER ANU GETECTOR FOR WIRELESS USE.

mmc/Uma msn 32H21, w15.

1,21 9,888. Patented Mar. 20, 19x17.

UNITED STATES PATENT OFFICE.

'finaux WALLBERG, or NEW Yonx, N. Y.

conmn RECEIVER ann n'ETEcToa :ron wxnELEssnsE.

To all 'whom it may concern;`

Be it known that I, FRANK WALLnEno, a

' citizen ot' the United States,-and a resident lreceiving wireless messages, the combined receiver and detector being held by the hand to the ear.

A more specific object of the invention is the provision of a wireless receiving device which vembodies a detector bridged across the terminals of the electromagnet of the telephone receiver and mounted Within the casing of the receiver just under the diaphragm, and associated with the receiver and mounted on the casing thereof 1s a rheostat in series with the .telephone electromagnet and detector, so that the device can be adjusted for various Wave lengths.

lVith such objects in view, and others which wiil appear as the description pro ceeds. the invention comprises various novel features' of' construction and arrangement of parts which will be set forth with particularity in the following description and claims appended hereto.

ln the accompanying drawing which illustrates one embodiment of the invention, and wherein similar characters of reference indi- -catc corresponding parts in all the views,

Figure l is a side view of the receiving device with a portion of the casing removed l to show the resistance wires of the rheostat;

`rig. 2 is a back View of the device;

Fig. 25 is a central vertical section;

l"ig. l is a lront view with the diaphragm, holding rap rcn'ioved; and

Fig. 3 is a diagrammatic view of the variousr circuit; connections.

li-icrrilng to the drawing, the device comprises a casing .1 composed of two concentric ('fy-lindrical shells 1 and a rear plate or head fl having au annular flange 4 t0 whit?-c .fhe shells are iittcd, a cup-shaped Specification of Letters Patent:

Application led September 21, 1915. Serial No. 51,769.

Patented Mar. 20, 1917.

holder 5 fitting into the shells, and a cappiece 6 which screws onto the cup or holder 5 so as to clamp between 'the capi 6 and holder the diaphragm -7 of the telephone transmitter. In the cup-shaped holder is the electro-magnet 8 which operates on the diaphragm to emit sound vibrations through the opening 9 of the lcap 6. The ends 10 and 11 of the magnet ywindings 12 are connected with terminal plates 13 and 14 respectively'` mounted on a supporting ring 15 within the holder 5. The terminal 13 is connected by a wire -16 with a binding post 17 on the ear plate 3 of the device, which binding post is adapted lto be connected to ground, as shown in Fig. 5. The f other terminal 14 of the electro-magnet is connected by a wire 1? with a movable contact 19 of a rheostat 2 0, the circular row of contact points 21 and the contact 19 being mounted in the rear plate 3 of the casing. One of the terminal contact points of the rheostat is connected by a wire 22 with a binding post 28 that is adapted to be connected with an aerial conductor 24 which may be any metal object, structure, Wire or the like suitable to answer as an antenna. The resistance windings 24 of the rheostat are coiled around the inner Yshell 2 of the casing and are surrounded by -the outer shell 1, leads 25 being taken oil from the windings to the respective Contact points 21. A detector 26 is shunted across the terminals 13 and 14 of the telephone electromagnet. This detector comprises a suitable crystal 27 resting on a conductor plate 28 that is connected by a wire 29 with the terminal 13, and bearing on the crystal is a conductor 30 in the form of a wire which is connected with the tcrminalll. The plate 28 and crystal 27 are suitably supported and incased or embedded in some plastic insulating material 31, the detector being positioned to one side of the electromagnet and under or behind the diaphragm 7. ccordin"` to this ari rangement the three essential elements of a receiving outfit, namely, the telephone receivcr. the detector and variable resistance, are all mounted in a single casing 'to constitute a unitary device, and to make use of thc-device it is merely necessary to connor-,t the binding posts 17 and 23 by wires with the ground'and some suitable part that will act as an antenna.-

From the foregoing description taken in connection with the accompanymg draw iii inge. ehe edi-einziges oi" 'the consiiueaion end ineivhod of operacion Wiii be readily onderlsinood by those sirilied in. ehe eri to which.' Aihe invention eepei'ieins, and while i here described @he nriociplcfboi'i' opel-ation., so esther Wiii 4'he .device which il :now conn Sider so be the bese einbodiineniJ thereof, desire izo here understood that che device shown is inereiy iiiustra'bive and 'ihnt changes may be mede when desired es fail Wiihin 4the scope of @he appended cleinis.

Having ihus d sciibed my invention, claim new and desire to secure by ieiters Peeiiiz:

l. A Wireless receiving ouiii, comprising e casing' and including e detector in the cesing, seid dej-ecior inciud g crystoi, condueiaor bearing on the crystal, and e piesnic ineierisl forming e seni over ehe crysta`. end conductor for ineinimining' `Jshe erf/stef, and conducor in permenen cominci.

2. e.. liend-eerried Wireless receiving ouiiii, coznpiising i uniary device including e casing, e ieiephone receiver therein., e de iecior mounted in the casing and connected across the terininols of the magnet oi' he ielephoiie receiver, and :i variebie iesisinnce carried by `ihe casing` and connectible in with the "ielephone eleetroniegne; und deiecoix7 rihe coinbinesion oi' si casing, o ciysiai iherein, e conductor bearing on the crystal, e piesiic meieriol covering the crysei and conductor :ind meineining e permanent con- -teci between the inve, and means for connecting ehe crystal und conductor in e Wireiess oircuit.

e. wiieiess receiving outfis comprising e casing including a pair of sheiis, o resistence Winding disposed between 'the shells, vsiiebie resislmnce contacts mounted on *the casing and connecied with the resistance winding, a. binding post with which one end of the resistance Winding is connected, a telephone receiver elecaroinagnet arranged in lie casing and having one 'terminal connected. with the variable resisten -e through the said contacts, :i binding post to which ihe other terminal of the electromagnet is connected, e diaphragm arranged Within the casinn and ussocisited with the electnoinagnei, and e delieeor connected across the eleci'oinzignet ierinineis and disposed at the seine side of 'die diaphragm as the electro-- magnet.

5. A Wireless-receiving device comprising l i if i @sienes ,5, culo-shaped hoieer therein, an eperured een applied to the beider, die phregm neder iie cap, e, Inegne; eine holder sind associated with the diaphragm, detecior in the 'casing1 and consis'fizing oi. e. crystal and contacting conductor, the een ininels ehe detector being conosci/ed- Wish. the eerniinais of the eiectroineggneiv and the deec'toi' being disposed et ehe seine side of the diaphragm. es the elecroinegnet, e 'veriebie resisivance device in the casing: and heving one terminal connecied with ehe eleciiro insignes, a, binding posi: so Wisch she other ierininai of the i'esistiince device is con i" neeted, end another binding posi; io which the ciber terininei of vthe elecroniegne; is connected.

deecior comprising :i crystal, e conn duceor bemin ihereon, supporting :means for fighe condo' or and crystal, and :i niesic eenling ineueiinl covering the ci'ysie'cl sind condueior where hey eontec 'for maintaining chem in perineoen'b engdgenieni'g.

i, ii wireless receiving outiis inciuding o receiver diaphragm, en electroinegnet in co operative relation thereviih, e'housingfor the eiectroinsgnei; und diaphragm, and e detector rigidly iiized on she housing,- and c inecied across he terminals of 1he electrow niigne, whereby o unitary receiver and d@ tecor is produced, seid deiecior comprising :i crystal, and a conductor hei/ing 1C Contact therewih.

'8L A Wireliss receiving outfit comprising e; so diaphragm, en eleetronmgnet Aessocimbed therewith, e housing in which the electromognefc and diaphragm are mounted, end deeetor carried by Jche housing and including e crystei connected with one 'termine/l of the magnet and a conductor conneced Wii'ah lihe other ei'niinel o the electromognei and bearing on ihe crystal, and plastic materiel covering;- ehe conductor and crysmi for moin taining' s permanent Contact between them.

9. The combination of e casing, with :i detecior therein, said detector including e crystal, conductor bearing on Jehe crystal, and :i plastic material. maintaining the crysai and conducor in perinnnen; Contact.

in iestioiiony whereof il have signed my neme to this specification in the presence of two subscribing Winesses.

FRA NK 'WLLBERG 

